The operators we work with follow a very specific schedule that involves many passengers, so waiting for any additional time is generally not possible because it would set the whole schedule back and cause delays.
However, if you know you are going to arrive late due to uncontrollable circumstances (such as a flight delay, for example), you can try contacting the operator directly as they might be able to wait for a few minutes or help you find a solution. The operator’s phone number can be found on your voucher.
If your reservation is for a private transfer, the operator will be more flexible with the times (if informed enough time in advance to adjust the schedule accordingly). For private transfers, the operator requests your flight information during the booking process so that they can adjust the departure time in case of any flight delays.